public class Testdemo1 {
    public static void main(String[] args) {
        int a=10;
        a++;
        System.out.println(a);//后置++
    }
    public static void main1(String[] args) {
        System.out.println(5/2);
        //System.out.println(5/0);
        System.out.println(11%2.5);//左右两边可以是余数
    }
}
